<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5">
<style>

body {
    background: #fff url("/pptr.png") no-repeat center 30px;
    background-attachment: fixed;
    margin-top: 36px;
}

</style>
</head>
<body>
  <div style="height: 3000px; background-color: antiquewhite;">tall</div>
  <button>Click me</button>
</body>
